If version v already exists, one new version is created and inserted in this version. The old version is renumbered as v + 1 and so on. If v is higher than the highest version existing (= w) the versions w + 1, w +2, ..., v are created. Default version is w + 1.

A new version may also be created in other commands (for example @OPEN-FILE). The version is then enclosed in quotes.